Could be pregnant but scared about weight gain

So my husband and I are not actively trying but we aren’t avoiding pregnancy either. We ran out of condoms and have had sex a few times since. The times we did have sex, I was not ovulating but my period is late by 3 days so I could be pregnant (not on birth control). It’s not unusual for my period to be late so idk. If I am pregnant of course I’m going to be super excited but also scared because I’m already over weight and I don’t want to gain a ton. My last pregnancy I gained 50lbs and I haven’t lost any of that weight. I gave birth in 2015 and its Just ridiculous to me. I’ve tried so many diets and the most I lost was 15lbs but then I fell off and started eating like shit again and gained the weight back. Has anyone else been pregnant and overweight and been worried about gaining too much? What we’re the results? Just for reference I’m 5’5 and my weight is 200lbs 😭